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The design from GM is not so great. They have the breather box that opens to the air located on the top right side of the tranny. Might be great for some, but for a plow truck in N. Mi. not so great.

I left the vent can/solenoid valve where it was. I used 5/8 ID hose to re-route the breather to the engine compartment. GM's setup had a low spot in the vent line on top of the tank somewhere, completely inaccessible. This line had frozen water in it that prevented tank from venting during fueling. With the breather end now in the engine compartment water shouldn't be able to enter the line and freeze.